Spring4 AOP入门（ApsectJ的注解方式）

旧城等待， 2022-01-21 01:15 267阅读 0赞

1 创建web项目一路jar包（Spring4个+日志2个+AOP2个+2AspectJ）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTY5MTA4_size_16_color_FFFFFF_t_70][]

2 在配置文件applicationContext.xml中引入aop约束（如果IOC要用注解开发的话就需要多引入一个context的约束）

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:aop="http://www.springframework.org/schema/aop" 
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    	
    </beans>

3 编写目标类，并配置交给spring托管(用实现接口的方式产生的是JDK的代理，不使用实现接口方式产生的是Cglib的代理)

public class OrderDao {
    	public void save() {
    		System.out.println("保存订单.....");
    
    	}
    
    	public String delete() {
    		System.out.println("删除订单.....");
    		return "执行删除操作的用户信息";
    
    	}
    
    	public void update() {
    		System.out.println("修改订单.....");
    
    	}
    
    	public void find() {
    		System.out.println("查询订单.....");
            //制造异常
    		//int i =1/0;
    
    	}

<bean id="orderDao" class="com.spring.demo1.OrderDao"></bean>

4 配置开启AOP注解的自动代理

<aop:aspectj-autoproxy />

5 编写切面类，在切面类中对目标类进行增强

@Aspect
    public class MyAspectAnno {
    	//@Before(value = "execution(* com.spring.demo1.OrderDao.save(..))")
    	@Before(value="MyAspectAnno.pointcut1()")
    	public void before() {
    		System.out.println("前置增强===========");
    
    	}
    
    	// 后置通知
    	//@AfterReturning(value = "execution(* com.spring.demo1.OrderDao.delete(..))",returning="result")
    	@AfterReturning(value="MyAspectAnno.pointcut2()",returning="result")
    	public void after(Object result) {
    		System.out.println("后置增强==========="+result);
    
    	}
    	//环绕通知
    	//@Around(value="execution(* com.spring.demo1.OrderDao.update(..))")
    	@Around(value="MyAspectAnno.pointcut3()")
    	public Object  around(ProceedingJoinPoint joinPoint) throws Throwable {
    		System.out.println("环绕前增强========");
    		Object object = joinPoint.proceed();
    		System.out.println("环绕后增强========");
    		return object ;
    
    	}
    	//异常抛出通知
    	//@AfterThrowing(value="execution(* com.spring.demo1.OrderDao.find(..))",throwing="ex")
    	@AfterThrowing(value="MyAspectAnno.pointcut4()",throwing="ex")
    	public void afterThrowing(Throwable ex) {
    	System.out.println("异常抛出增强=========="+ex.getMessage());
    
    	}
    	//最终通知
    	//@After(value="execution(* com.spring.demo1.OrderDao.find(..))")
    	@After(value="MyAspectAnno.pointcut4()")
    	public void after() {
    		System.out.println("最终增强===========");
    
    	}
    	
    	
    	//切入点注解：
    	@Pointcut(value="execution(* com.spring.demo1.OrderDao.save(..))")
    	private void pointcut1(){}
    	@Pointcut(value="execution(* com.spring.demo1.OrderDao.delete(..))")
    	private void pointcut2(){}
    	@Pointcut(value="execution(* com.spring.demo1.OrderDao.update(..))")
    	private void pointcut3(){}
    	@Pointcut(value="execution(* com.spring.demo1.OrderDao.find(..))")
    	private void pointcut4(){}
    	
    	
    }

6 配置切面类交给spring托管

<bean id="myAspect" class="com.spring.demo1.MyAspectAnno"></bean>

7 编写测试类（@Test报错的话就是要添加Junit的库  →  [https://blog.csdn.net/qq\_40969108/article/details/88350821][https_blog.csdn.net_qq_40969108_article_details_88350821]）

public class SpringDemo1 {
    
    	@Test
    	public void demo1() {
    		
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    		OrderDao orderDao = (OrderDao) applicationContext.getBean("orderDao");
    		orderDao.save();
    		orderDao.find();
    		orderDao.delete();
    		orderDao.update();
    	}
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTY5MTA4_size_16_color_FFFFFF_t_70 1][]

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[https_blog.csdn.net_qq_40969108_article_details_88350821]: https://blog.csdn.net/qq_40969108/article/details/88350821
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTY5MTA4_size_16_color_FFFFFF_t_70 1]: /images/20220121/6caeabca8c4d41aba388a8fe7105679a.png